<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>运算符优先级</title>
</head>
<body>
<script type="text/javascript">
	var a=1+2*3;
	var b=(1+2)*3;
	alert("a="+a+"\nb="+b);
</script>
</body>
</html>